MEGAFLO 400L Product Manual - page 25
Unvented Hot Water Cylinder
25
MAINTENANCE AND
SER
VICING (3)
Y
D
E
M
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R
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S
U
A
C
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B
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P
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A
F
1. M ains w a t e r s upply off.
2. S trainer bloc k ed.
and c lean (s ee page 22).
3. C old W ater C om bination
V alve inc orrec tly fitted.
3. C hec k and refit as required.
1.
not s w itc hed on.
1. C hec k and s w itc h on.
2
therm al c ut-out has operated.
2. C hec k . R es et by pus hing button.
(Figure 13, page 19)
3. IND IR E CT program m er s et
to C entral H eating only .
3. C hec k . S et to a Dom es tic H ot W ater
program m e.
4. IND IR E CT boiler not
w ork ing.
4. C hec k boiler operation. If fault is
s us pec ted c ons ult boiler m anufac turer's
ins truc tions .
5. IND IR E CT therm al c ut-out
has operated.
5. C hec k . R es et by pus hing button on c ut-
out. Chec k operation of indirec t therm os tat
(Figure 9, page 17 ).
6. IND IR E CT m otoris ed valve
not c onnec ted c orrec tly .
6 . C h ec k w iring a nd /o r p lu m bin g
c on ne c tio ns t o m otoris e d valve (s e e F ig 10
and 11) .
1. INTE R M ITTE N TLY
A i r V o l u m e i n e x p a n s i o n
v e s s e l h a s r e d u c e d
1 . S e e P a g e 3 0 ( O p e r a t i o n a l F a u l t s)
2. C O N TIN UA LLY
2 a. C he c k pre s s ure from 3.5 Bar Presssure
Reducing Valve. If grea te r tha n 3.5 bar
rep lac e P re s s ure R ed uc er c artridg e .
b. E x pans ion V alve s eat
dam aged.
W ater dis c harges from the
T&P Relief valve continually
1. Therm al c ontrol failure
N O TE w ater w ill be very hot.
1 . S w itc h off po w e r t o im m e rs ion h ea te r(s )
a nd s hu t d ow n b oile r. D O N O T t urn o ff
w ate r s up ply . W h en d is c h arge s top s
c he c k a ll th erm a l c on tro ls , rep lac e if fa ulty .
M ilk y w ater
1. O x y genated w ater.
releas es ox y gen bubbles w hen flow ing. The
m ilk ine s s w ill dis a pp e ar afte r a s ho rt w hile .
No hot w ater flow
W ater from hot taps is c old
W ater dis c harges from
8 B a r E x pans ion V alve
1. C hec k and open s top c oc k .
2. Turn off water s upply . R em ove s trainer
1 . W ate r from a p res s uris e d s y s tem
2 b. R em o ve E x p an s ion Relief c artrid ge from
8 Bar Pressure Relief valve and check seating. If
necessary fit new cartridge
a. 3 . 5 B a r P r e s s u r e R e d u c i n g
Valve not working correctly
1. Air volume in expansion vessel
has reduced
1 . S e e P a g e 3 0 ( O p e r a t i o n a l F a u l t s
s e c tio n for re-c h arging )
W ater dis c harges from t h e
T&P Relief valve intermittently
2. 8 Bar expansion relief valve
faulty
2 . C h e c k v a l v e a n d r e p l a c e i f n e c e s s a r y
I m m e r s i o n h e a t e r ( D i r e c t )
I m m e r s i o n h e a t e r ( D i r e c t )
Fault finding
The Fault Finding chart (Table 8) will enable operational faults to be identified and their possible causes rectified. Any work carried out on the MEGAFLO
Eco Plus unvented water heater and its associated controls MUST be carried out by a competent installer for unvented water heating systems. In case of
doubt contact the MEGAFLO Eco Plus Service Department , Section 4, page 32.
Table 8 - Fault Finding Chart